Esfahan, Iran

The Malek-Ashtar University of Technology is a university of engineering, science, and military in Iran. This university was opened in 1986. Its campuses are located in Tehran and Isfahan and Urmia. The university is named after Malik al-Ashtar,one of the most loyal companions of Ali Ibn Abi Talib. Malek-Ashtar University of Technology is often referred to "MUT" by the abbreviation.The university does not provide free access and is not open to visitors. Visitors can only enter the university after getting permission from the person they want to visit. Their identification will be registered at the entrance and they should give a valid identification card that can be collected at the exit.Malek-Ashtar University of Technology provides both undergraduate and graduate programs. Funding for Malek-Ashtar University of Technology is provided by the Ministry of Defense. All the academic staff are employees of the Iranian Ministry of Defense and they cannot leave Iran without permission. Admission is done by the national entrance examination administered yearly by the Ministry of Science, Research and Technology.In 2005, Malek-Ashtar University of Technology was identified by the German government as an industry in a mainly civilian institution which also conducts military research and development. In June 2008, Malek-Ashtar University was listed by the European Union as an entity linked to Iran's proliferation-sensitive nuclear activities or Iran's development of nuclear weapon delivery systems. Within their jurisdiction, European Union members must block all funds or economic resources of the listed entity. Wikipedia.


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Sheikh H.,Malek-Ashtar University of Technology
Scripta Materialia | Year: 2011

The hot accumulative roll bonding (ARB) process was applied on sheets of an Al-Mg alloy for up to six cycles. The electron backscattering diffraction (EBSD) method was employed to investigate the microtextural aspects of the starting material and the ARBed samples. The results indicate that the presence of shear bands changes the components of the microtexture. At the fourth and sixth cycles, the overall microtexture intensity increases and the main microtextural components are copper, Dillamore, Goss, and brass. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Ghasemi A.,Malek-Ashtar University of Technology
Journal of Magnetism and Magnetic Materials | Year: 2013

Substituted strontium ferrite SrFe12-x(Ni0.5Mn 0.5Zr)x/2O19/multi-walled carbon nanotubes (MWCNTs) composites were prepared by a sol-gel method. X-ray diffraction patterns confirm the formation of single phase ferrite nanoparticle and nanocomposites of ferrite/carbon nanotubes. Fourier transform infrared spectroscopy demonstrates the existence of functional groups on the surface of carbon nanotubes. Superconducting quantum interference device measurements showed that the values of specific saturation magnetization increases, while coercivity decreases with an increase in substitution content. Zero field cooled magnetization and field cooled magnetization curves display that with an increase in substitution content, the blocking temperature increases. Field emission scanning electron microscopy micrographs demonstrate that ferrite nanoparticles were attached on external surfaces of the carbon nanotubes. The investigation of the microwave absorption indicates that with an addition of carbon nanotubes, the real and imaginary parts of permittivity and reflection loss enhanced. It is found that with increasing the thickness of absorbers, the resonance frequencies shift to lower regime. © 2012 Elsevier B.V. All rights reserved.


Keshavarz M.H.,Malek-Ashtar University of Technology
Propellants, Explosives, Pyrotechnics | Year: 2010

This paper describes the development of a simple model for predicting the impact sensitivity of nitroaromatics, benzofuroxans, nitroaromatics with α-CH, nitramines, nitroaliphatics, nitroali-phatics containing other functional groups, and nitrate energetic compounds using their molecular structures. The model is optimized using a set of 86 explosives for which different structural parameters exist. The model is applied to a test set of 120 explosives from a variety of the mentioned chemical families in order to confirm the reliability of a new method. Elemental composition and two specific structural parameters, that can increase or decrease impact sensitivity, would be needed in this new scheme. The predicted impact sensitivities for both sets have a root mean square (rms) of deviation from experiment of 23 cm, which shows good agreement with respect to the measured values as compared to the best available empirical correlations. © 2010 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.


Keshavarz M.H.,Malek-Ashtar University of Technology
Propellants, Explosives, Pyrotechnics | Year: 2013

This paper describes an improved simple model for prediction of impact sensitivity of different classes of energetic compounds containing nitropyridines, nitroimidazoles, nitropyrazoles, nitrofurazanes, nitrotriazoles, nitropyrimidines, polynitroarenes, benzofuroxans, polynitroarenes with α-CH, nitramines, nitroaliphatics, nitroaliphatic containing other functional groups, and nitrate energetic compounds. The model is based on some molecular structural parameters. It is applied for 90 explosives, which have different molecular structures. The predicted results are compared with outputs of complex neural network approach as one of the best available methods. Root mean squares (rms) of deviations of different energetic compounds are 24 and 49 cm, corresponding to 5.88 and 12.01 J with 2.5 kg dropping mass, for new and neural network methods, respectively. The novel model also predicts good results for eight new synthesized and miscellaneous explosives with respect to experimental data. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Keshavarz M.H.,Malek-Ashtar University of Technology
Journal of Hazardous Materials | Year: 2010

A simple method is used to predict heats of sublimation of energetic compounds, which include nitroaromatics, nitramines, nitroaliphatics and nitrate esters. Molecular weight, some specific functional groups and structural parameters are fundamental factors in the new model. The root-mean-square deviation (rms) from experiment has been calculated for the predicted results of 92 different compounds. The calculated results for 15 compounds are also compared with complicated quantum mechanical computations, where computed outputs were available. The rms deviations of new correlation and reported quantum mechanical method are 9.9 and 13.8kJ/mol, respectively. The present method improves earlier efforts of previous models through its application for important classes of energetic compounds, which contain the energetic bonds Ar-NO 2, N-NO 2, C-NO 2 and C-O-NO 2. © 2009 Elsevier B.V.


Ghasemi A.,Malek-Ashtar University of Technology
Journal of Magnetism and Magnetic Materials | Year: 2012

In this research work, magnetic multi-walled carbon nanotube (MWCNTs) nanocomposites have been created by the assembly of MgCoZr substituted barium ferrite film onto the surface of MWCNTs. Microwave absorption of the MWCNTs/doped barium ferrite nanocomposites is evidently enhanced compared to that of pure MWCNTs and substituted ferrites. The maximum reflection loss increased significantly with an increase in volume percentage of MWCNTs. Reflection loss evaluations indicated that nanocomposites display a great potential application as thinner and lighter wide-band electromagnetic wave absorbers. © 2011 Elsevier B.V. All rights reserved.


Ghasemi A.,Malek-Ashtar University of Technology
Journal of Magnetism and Magnetic Materials | Year: 2011

In this research work, magnetic multi-walled carbon nanotube (MWCNT) nanocomposites have been created by the assembly of ZnSn substituted strontium ferrite film onto the surface of MWCNTs. X-ray diffraction and transmission electron microscopy were used to demonstrate the successful attachment of ferrite films to MWCNTs. Mössbauer spectroscopy indicates that the ZnSn ions preferentially occupy the 2b and 4f 2 sites. Vibrating sample magnetometry confirms the relatively strong dependence of saturation magnetization with the volume percentage of MWCNTs. Microwave absorption of the MWCNTs/doped strontium ferrite nanocomposites is evidently enhanced compared to that of pure MWCNTs and ferrite. The maximum reflection loss increased significantly with an increase in volume percentage of MWCNTs in nanocomposites. Reflection loss evaluations indicated that the nanocomposites display a great potential application as wide-band electromagnetic wave absorbers. © 2011 Elsevier B.V. All rights reserved.


Saranjam B.,Malek-Ashtar University of Technology
Ocean Engineering | Year: 2013

In the last decade much research works has been carried out in order to improve the operation and speed of the underwater vehicles. In this study important supercavitation features including formation, evolution and loss of supercavitation and partial cavitation for an underwater moving body are both experimentally and numerically investigated. To achieve this goal the natural supercavitation experiment was conducted through a moving body and the trajectory of the body and the shape of supercavity profile were recorded by a high speed camera. For the numerical simulation of the underwater moving body the unsteady Reynolds averaged Navier-Stokes equations are coupled to a six-degree-of-freedom (6DOF) rigid body motion model. The numerical results are validated by comparing the predicted trajectory and velocity of the body with presented experimental data. A good agreement between the predicted and experimental values ensures the accuracy of the prepared numerical algorithm that used in the present study. The results reported in this paper illustrate that the above experimental method and numerical algorithm can be one of the most powerful and beneficial tools for the supercavitating underwater vehicles optimization and performance analysis. © 2012 Elsevier Ltd. All rights reserved.


Ghasemi A.,Malek-Ashtar University of Technology
Journal of Magnetism and Magnetic Materials | Year: 2012

SrFe 12-x(Zr 0.5Mg 0.5) xO 19 nanoparticles and thin films with x=02.5 were synthesized by a sol-gel method on thermally oxidized silicon wafer (Si/SiO 2). Structural and magnetic characteristics of synthesized samples were studied employing x-rays diffraction (XRD), transmission electron microscopy (TEM), magnetic susceptometer, atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), and vibrating sample magnetometer (VSM). TEM micrographs display that the narrow size distribution of ferrite nanoparticles with average particle size of 50 nm were fabricated. Fitting obtained data of effective magnetic susceptibility by Vogel-Fulcher law confirms the existence of strong magnetic interaction among fine particles. XRD patterns and FE-SEM micrographs demonstrated that single phase c-axis hexagonal ferrite films with rather narrow grain size distribution were obtained. AFM micrographs exhibited that the surface roughness increases with an increase in Zr-Mg content. It was found from the VSM graphs that with an increase in substitution contents the coercivity decreases, while the saturation of magnetization increases. The Henkle plots confirms the existence of exchange coupling among nano-grain in ferrite thin films. © 2011 Elsevier B.V. All rights reserved.


Keshavarz M.H.,Malek-Ashtar University of Technology
Journal of Hazardous Materials | Year: 2011

A new reliable simple model is presented for estimating the condensed phase heat of formation of important classes of energetic compounds including polynitro arene, polynitro heteroarene, acyclic and cyclic nitramine, nitrate ester and nitroaliphatic compounds. For CHNO energetic compounds, elemental compositions as well as increasing and decreasing energy content parameters are used in the new method. The novel correlation is tested for 192 organic compounds containing complex molecular structures with at least one nitro, nitramine or nitrate energetic functional groups. This work improves the predictive ability of previous empirical correlations for a wide range of energetic compounds. For those energetic compounds where group additivity method can be applied and outputs of quantum mechanical computations were available, it is shown that the root mean square (rms) deviation of the new method is lower. © 2011 Elsevier B.V.

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